# Category: Direct-Current Circuit Analysis

Direct-Current Circuit Analysis

## Voltage Divider Networks

Resistances in series produce ratios of voltages, and these ratios can be tailored to meet certain needs by means of voltage divider networks. When a voltage divider network is designed and assembled, the resistance...

## Kirchhoff’s Second Law

The sum of all the voltages, as you go around a circuit from some fixed point and return there from the opposite direction, and taking polarity into account, is always zero. Does this seem...

## Kirchhoff’s First Law

The physicist Gustav Robert Kirchhoff (1824–1887) was a researcher and experimentalist in a time when little was understood about how electric currents flow. Nevertheless, he used certain commonsense notions to deduce two important properties...

## Power Distribution in Parallel Circuits

When resistances are wired in parallel, they each consume power according to the same formula, P = I 2R. But the current is not the same in each resistance. An easier method to find...

## Currents through Parallel Resistances

Refer to the schematic diagram of following figure. The resistances are called Rn. The total parallel resistance in the circuit is R. The battery voltage is E. The current in any particular branch n,...

## Voltage across Parallel Resistances

Imagine a set of ornamental light bulbs connected in parallel following figure. This is the method used for outdoor holiday lighting or for bright indoor lighting. It’s easier to repair a parallel-wired string of...

## Voltages across Series Resistances

The bulbs in the string of figure : Light bulbs in series, with an ammeter (A) in the circuit. being all the same, each get the same amount of voltage from the source. If...

## Current through Series Resistances

Have you ever used those tiny holiday lights that come in strings? If one bulb burns out, the whole set of bulbs goes dark. Then you have to find out which bulb is bad,...